How many it is necessary to write to manuscripts of 750 pages figures to number all pages (to consider each figure so many time how many it is written)?

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If each figure to consider so many time how many it napisanato: 9 one-digit 99-9=90 two digit 750-99=651 three digit 9*1+90*2+651*3=9+180+1953=2142 figures will leave on writing of page numbers.
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Answer add